Added demonstration of test plugins

tests/test_plugins.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+from openflexure_microscope.camera.pi import StreamingCamera
+from openflexure_stage import OpenFlexureStage
+from openflexure_microscope import Microscope
+from openflexure_microscope.plugins import PluginMount, load_plugin, search_plugin_dirs
+
+import atexit
+import logging, sys
+logging.basicConfig(stream=sys.stderr, level=logging.DEBUG)
+
+if __name__ == '__main__':
+    microscope = Microscope(StreamingCamera(), OpenFlexureStage("/dev/ttyUSB0"))
+
+    plugins_list = search_plugin_dirs([], include_default=True)
+
+    for i in plugins_list:
+        module = load_plugin(i)
+        microscope.plugin.attach(module)
+
+    # Check that default tets plugins have loaded
+    print("RUNNING PLUGIN METHODS:")
+    microscope.plugin.test1.run()
+    microscope.plugin.test2.run()
+
+    microscope.close()